Frank Drewes Sigrid Ewert Renate Klempien-Hinrichs Hans-Jörg Kreowski Computing Raster Images from Grid Picture Grammars. 113-121 2000 conf/wia/2000 CIAA http://link.springer.de/link/service/series/0558/bibs/2088/20880113.htm db/conf/wia/ciaa2000.html#DrewesEKK00